Under Sink Water Filters

Looking for under sink water filter reviews & Guides? You’re not alone. This is what is best for 2019.

The under sink water filter technology is as old as the Egyptians, but it’s been seeing a resurgence lately. Recent events like the Flint water crisis have made people more aware than ever of their own water quality. There are many filtration options out there, from small Brita filters up to large, whole-house systems that filter everything from your shower to your washing machine.

How are you going to decide what is best?

In this guide, we have included five (5) top products in the mid-sized category of under sink water filtration system. We will talk about what they filter out, what they don’t, and how much maintenance they need, among other things.

Here are the five (5) best under sink water filters reviews for 2019, including their technical aspects:

Best Under Sink Water Filter Reviews Summary Table 2019

NameAquasana AQ 5300 3 Stage Max Flow Aquasana AQ5300 under sink water filter review - ACWCuZn UC-200CuZn UC-200 - under sink water filterApec Water WFS 1000Apec Water WFS-1000 water filterWoder 10K-Gen3Woder 10K-Gen3 water filterDoulton Ultracarb 0.5 Micron 10” (Alkaline)
Doulton Ultracarb 0.5 Micron 10” 2-stage water filter (with Alkaline)
Main FeaturesRemoves up to 99 percent of 77 pollutants present in municipal waters.Filters up to 50000 gallons, enough for a big family.Removes common contaminants and is under an affordable price compared to other filters.Long lasting filter removing important contaminants such as heavy metals.The Alkaline filter offers high benefits for your water taste and more importantly, for your body mineral requirements
Pollutants Removed- Heavy metals.
- Herbicides & Pesticides.
- Bacteria and asbestos.
- Heavy metals such as lead, Cr6+, mercury, cadmium and others.
- Herbicides and Pesticides.
- Bacteria and micro particles (not Total Dissolve Solids).
Sediments, organic and inorganic compounds, heavy metals and chlorine.Organic compounds, heavy metals, chlorine and sediments.- Heavy metals such as Lead.
- Micro-organisms such as parasites and small particles.
- Organic compounds & Chloride.
- Acidifying particles.
Flow rate0.5 GPM (2.0 lpm).2 GPM (12.6 lpm).0.72 GPM (2.7 lpm).2 GPM (12.6 lpm)0.5 GPM (1.89 lpm).
Water Pressure (Optimal - PSI)20-80.65.20-85.65.10-125.
Size/designMedium / Eco-friendly.
12 x 4.2 x 9 inches.
Small to medium size.Medium to large size.Small sizeMedium size
Filters made of- Pre-filter
- Activated Carbon.
- Catalytic Carbon with Ion Exchange.
- Coconut shell carbon.
- KDF-55 (Kinetic Degradation Fluxion).
- Sediment membranes (micro).
- Polypropylene Sediment Filter.
- 2 x Activated Carbon FIlters (double filtration).
- Activated Carbon.
- Micro membrane.
-1st filter: ceramic, activated carbon, ion resin.
-2nd filter: Water Ionizer.
Filters Life (months)6 months / 600 gallons.5 years / 50000 gallons.12 months3 years / 10000 gallons.6 months / 600 gallons.
Water sourceMunicipal water (chlorinated).Municipal water (chlorinated).Both, municipal water (chlorinated) and well water.Municipal water (chlorinated).Municipal Water (Chlorinated).
Warranty1 year.5 Years.1 year.3 years.1 year.
CertifiedNSF/ANSI 42, 53, 401 and P473.NSF/ANSI 42 and 61.NSF/ANSI 42 and 61.NSF/ANSINSF/ANSI 42 and 53.
Read ReviewRead ReviewRead ReviewReview Coming Soon!Review Coming Soon!

Doulton Ultracarb 0.5 Micron 10” 2-stage filter (with Alkaline)


✅ Filters 99% of micro-organisms.

✅ Filters acidifying particles leaving the good ones for your body to absorb.

✅ Easy to maintain and effective against growth bacteria.

⊖ Only 600 gallons capacity (2.27 cubic meters); still great for your water needs.

⊖ It is a little bit pricy but this means good quality.

Doulton Ultracarb 0.5 Micron 10” 2-stage water filter (with Alkaline)This Dulton Ultracarb is a 2 cartridge filtration system is a little different than our previous entries.

The first filter (ceramic filter) is capable of filtering in 3-stages including the removal of micro-organisms such as Cryptosporidium (parasite), small particles, organic compounds, chlorine and, heavy metals such as lead. To refine the quality of the water filtered, there is an infusion with silver that reduces the bacteria growth.

The secondary filter (alkaline), will increase the pH of the water by separating and removing acidifying particles through electrolysis; this leaves the antioxidants, improving the flavor of the water and helping the abortion of minerals by your body.

This filter is only rated for 600 gallons of total capacity. This may seem low, but this is specifically a drinking water filter. It’s not designed for washing dishes (you still can use it for that but will reduce the lifetime of the cartridges).

The low water pressure makes this abundantly clear, but there are no issues if you’re only using the Ultracarb for drinking water.

This water filter system comes with a faucet ready wit all the elements for easy installation.

Woder 10K-Gen3 Water Filter


✅ Important components for your body hydration are left in the water.

✅ Very easy to install (directly to your cold water line).

✅ It is capable of filtering 10000 gallons of water.

⊖ Does not filter heavy metals.

⊖ Only filters municipal water (disinfected).

⊖ Fluoride is not removed by the filter.

Woder 10K-Gen3 water filterThe Woder 10K-Gen3 filtration system is designed to remove harmful contaminants without reducing the mineral content of your water, this means, it specifically does not filter out calcium, potassium, sodium, magnesium or phosphorus, which are essential for bodily functions.

This filter is rated for 3 years or 10,000 gallons. It will last far shorter if you have well water, due to heavy mineral content and other potential contaminants. It provides plenty of water pressure.

The Woder 10K-Gen3 has a convenient, in-line installation system, and comes with 3/8” supply lines to integrate it with your current setup.

It can mount in a soap hole, on the back of the cabinet, or wherever else is convenient for you.

Aside from filtering sediments, organic compounds and chlroine, it is also capable of filtering heavy metals including but not limited to lead, mercury and Cr6+ (very dangerous element).

Under Sink Water Filter Reviews: Verdict

No matter what you end up buying, we hope you found this guide helpful. There are many choices, so consider your options carefully before buying.

It is very important that you read and cover all the doubts you may have regarding what are the best water filters and what you have to consider to choose the right technology. If you are still unsure about that, you can still find the information in our water filters buying guides page.

We pride ourselves on the helpful information we provide, and we hope our under sink water filter reviews are as helpful as possible.

Your Quick Guide to Under Sink Water Filters for 2019.

If you want to learn about the best under counter water filtration systems, read more here!.

We all want clean water for our daily needs. This often means installing a filtration system. If you want to learn more about under sink water filters, then you’re in the right place!.

How Does an Under Sink Water Filter Work?

These water filters are stored under your counter. Your water is filtered on-demand, as this system is incorporated into your original sink plumbing. You will have a steady flow of clean water coming from either your original tap or a filtered water tap.

This category of water filters removes dangerous elements such as chlorine, lead, pesticides and bacterial pollutants from your water.

Cartridges with activated carbon technology is used as part of this filter system. However, in modern filtration systems, it is more common, and a good idea, to have a combination of filters to eliminate more contaminants. For example, when a special alumina filter is incorporated, then these water filters can also remove fluoride and arsenic.

Under counter water filters are relatively easy to install once you have sufficient space underneath your sink. Since such filtration systems fit under your countertop, they don’t create any clutter in your space.

Positives and to Improve

There are many other types of water filtration systems on the market. Nevertheless, let’s consider some of the advantages and disadvantages of under sink water filters:


  1. Keeps your kitchen flow!. These filters don’t intrude in your space.
  2. No countertop clutter. The entire unit is stored under your counter.
  3. Great filtration speed. The usual flow rate of your taps is often unaffected by the presence of the filter.
  4. No waste water is produced. Everything that’s filtered, you’ll use!.
  5. If you purchase a multi-filter system, then you can remove a wide range of contaminants.
  6. This filter is cost effective – from the initial purchase to the maintenance costs.
  7. Easy maintenance routine!. You just need to keep on top of cartridge replacement.


  1. Although, these filters are hidden they can be a bit large. This means losing under counter space if you require some.
  2. Installation required. Although, it is not very difficult to install an under sink water filter, you still have to do some slight modifications.
  3. You only have filtered water at the installation point. It’s not a whole house system, so you can only get pure water at one sink in your home.

Types of Under Counter Water Filters

Now, let’s consider this filtration system in more detail. There are two types of such filters: the conventional and the simple system. Let’s consider each system along with their pros and cons:

  • Conventional Under Sink Water Filter

Conventional under counter water filterThis system was the initial design for a under sink water filter. It requires a separate faucet for dispensing the filtered water that it produces. You would reroute some of your cold water supply through this filtration system via a connection. Once your water is filtered, you access it via the separate faucet.

You would still have cold and hot water flowing unfiltered from your usual faucets.


  1. Cartridge replacement frequency is low. Since you only filter a portion of your cold water supply, each cartridge lasts longer.
  2. Better water quality. Since the water pressure is lower, then the filter can complete all its filtration processes.
  3. Easy to install on all plumbing infrastructure.


  1. More hardware! You will need an extra faucet.
  2. Kitchen alterations required. You will need a sink with dual faucet holes. Alternatively, you can drill a new hole in your existing sink.
  3. Your filtered water will have a lower flow rate because you are only filtering some of your cold water supply, however is good enough for your needs at the kitchen.

Now, lets review the simple under sink water filtration system:

  • Simple Under Sink Water Filter

Simple Under counter water filterThe simple system does not need a separate faucet as it fully integrates into your existing plumbing infrastructure. Your cold water goes through the system as the water filter is connected to the supply line. Therefore all the cold water from your regular kitchen faucet will be filtered.

Nevertheless, have in mind that your hot water will not be filtered.


  1. There’s no need for an extra faucet. You use your regular faucet for this system.
  2. No need to mess with your kitchen design! There is zero need for drilling any holes.
  3. Easy installation. You will simply integrate the filter into your cold water supply line with flexible connectors.


  1. More frequent cartridge replacement. Since you’re filtering your entire kitchen’s water supply, you’ll need to replace your filter cartridges more frequent.
  2. Possible inefficiency. Your flow rate at the tap may be slightly reduced but it’ll depend on filtration system size.

What to Consider when Selecting the Best Under Counter Water Filtration System.

We have seven (7) reasons why you should study more in detail the importance of selecting the best under sink water filtration system before expending some money. Here’s your checklist:

  1. Space: You should first figure out if you have enough space under your sink. Make sure that you take detailed measurements. You don’t want to make a purchase that won’t fit!.
  2. Home usage profile: You need to know the volume of water required to satisfy your family’s usage profile. The more family members you have, the greater your household’s water needs.
  3. Clean water requirements: You should first, do a home water quality test. You will then know which water filter model should be installed to remove the specific contaminants present in your water.
  4. Efficiency vs. cost: While you want a great water filter that produces perfectly clean water, also pay attention to the cost. Higher efficiency means a higher cost. This is a trade-off that you will need to balance as you select the best model for your budget and requirements. The good news is that this type of water filtration system tends to be affordable.
  5. Required water pressure: Clean water is good, but clean water when you need it, is far better. Select a filter model that can handle your home’s water pressure. The simple under sink water filter system tends to handle higher water pressure, this translate to more flow rate, less waiting time to fill up you glass or jug and most importantly. This also means that all pollutants present in the water may not be completely filtered. If your water is heavily contaminated, a conventional under sink water filter could do a better job (reduced water pressure due to its configuration).
  6. Cartridge replacement rate: Your water filter is only as good as its cartridges. Longer lasting cartridges with the capacity to handle larger water volumes are more effective. Depending on the selected model, you may need to replace the cartridges twice per year (every six (6) months), each year, or every three (3) years. However these replacement time frames are only suggestions. If your water supply requires more filtration, then your system will be heavily taxed. You may need to replace the cartridges more frequently than stated.
  7. Installation: Under sink water filters are easy to install as a DIY project. But if you can’t follow a video tutorial online to do the installation correctly, don’t force it! First contact the customer support for your water filtration system. If you still can’t get it done with that extra info, then call in a professional plumber for your install.

Final Thoughts

Water filtration is a necessity if you desire clean water for your daily activities. There are many areas that you need to consider in your decision to purchase the right water filter.

Now, with all the information in mind, the final step is to assess and identify the specific condition or scenario at your home (water flow rate you need to filter, contaminants to be removed (according to your consumers report or water quality report) and last but not least, the available space to install the right under counter water filter) so that you can properly define what would be the best water filtration solution for your family or colleagues at work. 

Finally, we hope that you now have all the information about the best under sink water filter systems to make an informed choice for your household or office requirement.


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